利用大洋浮标数据和NCEP再分析资料对FY-2C红外分裂窗通道的绝对辐射定标  

ABSOLUTE RADIOMETRIC CALIBRATION OF FY-2C INFRARED SPLIT-WINDOW CHANNELS BY USING SEA BUOY DATA AND NCEP REANALYSIS DATA

作　　者：张勇[1,2] 李元[1] 戎志国[1] 胡秀清[1,2] 许健民[1] 

机构地区：[1]国家卫星气象中心中国遥感卫星辐射测量与定标重点开放实验室,北京100081 [2]中国科学院遥感应用研究所遥感科学国家重点实验室,北京100101

出　　处：《红外与毫米波学报》2009年第3期188-193,234,共7页Journal of Infrared and Millimeter Waves

基　　金：国家自然科学基金项目(40701118);国家“863”计划项目(2007AA12Z145);遥感科学国家重点实验室开放基金项目共同资助

摘　　要：介绍利用大洋浮标数据和NCEP再分析资料对FY-2C红外分裂窗通道进行在轨绝对辐射定标的方法,并选择了2006年10个时次的卫星数据进行辐射定标试验.将利用这种方法获得的定标结果与FY-2C卫星数据产品中提供的定标查找表进行比较分析,结果表明两套不同的定标系数反演的大气层顶(TOA)亮度温度的主要差别集中在云顶、冰雪覆盖区域等低温像元;而在常温区的陆表和海表像元定标结果差别较小,反演的TOA亮温差在2K左右.提出的替代定标方法可以极大地提高定标频次,为实现FY-2C红外分裂窗通道的实时绝对辐射定标提供了重要的方法基础.A method of absolute radiometric calibration for FY-2C infrared split-window channels by using sea buoy data and NCEP reanalysis data was introduced. In 2006, ten times remote sensing data were selected to obtain the radiometric calibration coefficients. The calibration results obtained from this new method were compared with the product brightness temperature provided by FY-2C. The results show that the biggest differences of the brightness temperatures at the top of atmosphere（TOA） obtained from these two suits of calibration coefficients are mainly located at the low surface temperature pixels, such as the top of clouds and snow covered areas, however, the calibration differences are small in the normal temperature pixels of land and sea surface areas, and the differences of TOA brightness temperature are mainly around 2K. This new vicarious calibration method can increase the calibration frequency and provide a methodological foundation for the real-time radiometric calibration of FY-2C infrared split-window channels.

关 键 词：遥感 辐射定标 大洋浮标数据 NCEP再分析资料 分裂窗通道 

分 类 号：TP732.2[自动化与计算机技术—检测技术与自动化装置]